Electric alarm system.



Nbl-790.l89. E PATENTED MAY-16,1905.

' COOPER.

ELECTRIC ALARM SYSTEM. APPLICATION P ILED'OOT. 15, 19 04.

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. I I I y UNITED STATES Patented May 16, 1905.

PATENT OFFICE.

ELECTRIC ALARM SYSTEM.

SPECIFICATION forming part of Letters Patent No. 790,189, dated May 16,1905. Application filed October 15, 1904- Serial No. 228,620.

. To all whom it may concern:

Be it known that I, HIrPoLYTE M. CooPnR, a ci-tizenof the United States,residing at Coopers Plains, in the county of Steuben and State of NewYork, have invented new and useful Improvements in Electric AlarmSysterms, of which the following is a specification This inventionrelates to electric alarm sys-v terns.

tems; furthermore, to increase their eificiency in operation and todecrease the expense at tending their manufacture and instalment.

With the foregoing and other minor objects in View, which will appear asthe description proceeds, the invention resides in an alarm systemcomprising an initial circuit which includes a plurality of alarm-boxes,each having suitable circuit-breaking means therein, a primary circuitlncludlng novel means for causing the actuation of an alarm, aparallelthereof.

In the accompanying drawing, forming part of this specification, thefigure 1s a partly-sectional, partly perspective, and partlydiagrammatic view of an alarm system constructed in accordance with theinvention.

Referring to the drawing, the initial c1rcuit includes a battery 1, wire2, magnet 3, and a plurality of alarm-boxes 4, each having a suitablecircu1t-break1ng device, such as a energized and permits the armature 6to drop by gravity into engagement with the contact 7, which is alsoincluded in the primary cir- The objects of the invention are to improveand simplify the construction of such syscuit. The primary circuitincludes the battery 8, armature 6, contact 7, wires 9 and 10,contact-point 11, contact-spring 12, wire 13, motor 14, and wires 15 and16. The parallel circuit includes the battery 8, armature 6, contact 7,wires 9 and 17, magnet 18, and wire 19.

' From the foregoing description it will be apparent that the breakingof the initial circuit'by deenergizing the magnet 3 serves to permit thearmature 6 to drop against the contact 7, and thus close both theprimary and parallel circuits. The motor 14, which is included in theprimary circuit, may be of any suitable form and construction; In theembodiment of invention illustrated in the drawing said motor comprisesan armatureshaft 20, having thereon a pinion 21, which serves to operatea gear-wheel 22, provided with an eccentrically-disposed pin or crank23, which operates a sleeve 24, having connected to opposite sidesthereof the pistons 25 of air-compressors 26, the outlet-pipes 27 ofwhichare controlled by suitable oneway or check valves 28, pivoted at 29and adapted to swing open when air is forced out of the compressors orcylinders 26 and to swing closed immediately after that operation toprevent the reentrance of air upon the suction-stroke of thecompressors. The check-valves 28 are located in suitable airchambers 30,which communicate, by means of pipe-sections 31, with an air-supply pipe32, communicating with a cylinder 33, having therein a piston 34.Arranged in the piping 32 at a convenient point is anelectrically-operated valve 35, which is formed with a projection36,adapted to close the end of an outletpassage 37, extending throughthe magnet 18. When the parallel circuit is closed and the magnet 18 isenergized, the valve 35 is drawn upward so as to close the passage 37through the magnet 18. Connected with the piston 34 is a piston-rod 38,having thereon a slide-valve 39, formed with an annular groove 40. Uponthe outer end of the slide-valve 39 is a rod 41, which is adapted tostrike against an insulating-block 42 on the contact-spring 12.Associated with the casing 43 of the slide-valve 39 is a line of piping44, which leads from asuitable source of steam or other fluid supply andcommunicates with a steam-whistle 45. The piston-rod 38 is surrounded bya coil-spring 46, which is located within the cylinder 33 and bearsagainst the piston 34, said spring serving to retract the piston whenthe pressure Within the cylinder is relieved.

Constructed as above described, the operation of the improved alarmsystem is as follows: It Will be understood that the initial circuit,including the battery 1, wires 2, magnet 3, and alarm-boxes 4, isnormally closed, as heretofore explained, whereby the magnet 3 isenergized in such manner as to attract the armature 6, thus maintainingthe primary and parallel circuits normally open. WVhen an alarm is to besounded, the knife 5 in one of the alarm-boxes is raised, thus breakingthe initial circuit and causing the armature 6 to descend by gravityuntil it rests against the contact 7. This movement of the armature 6closes simultaneously the primary and parallel circuits. The primarycircuit, through the battery 8, armature 6, contact 7, wires 9 and 10,contact-spring 12, wire 13, motor 14, and Wires 15 and 16, causes theactuation of the motor 14 and air compressors 26, which act to force theair into the piping 32. The closing of the parallel circuit through thebattery 8, armature 6, contact 7, wires 9 and 17, magnet 18, and wires16 and 19 causes the magnet 18 to be energized,with the result that thevalve 35 is attracted thereto and the projection 36 effectually closesthe outlet 37. The air compressed by the cylinders 26 passes into thecylinder 33 and forces the piston 34 toward the right. As soon as theslide-valve 39 on the piston-rod 38 is moved a sufficient distance tocause the annular groove 40 to register with the piping 44 thesteam-whistle is sounded. At this moment the rod 41 strikes against theinsulating-block 42 on the contactspring 12 and forces said spring awayfrom the contact-point 11, thus breaking the primary circuit andstopping the operation of the motor, for which reason an excessivesupply of compressed air to the cylinder 33 is avoided. The compressedair which remains in the pipe 32 and cylinder 33 is sufiicient to holdthe piston in its advanced position, so that the steamwhistle continuesto sound. hen it is desired to stop the sounding of the whistle, theinitial circuit is closed, thus energizing the magnet 3 and causing thearmature 6 to break the parallel circuit by moving away from the contact7. As soon as the parallel circuit is broken the magnet 18 isdeenergized and the valve 35 descends by gravity into its lowestposition, thus permitting the air in the cylinder 33 to exhaust throughthe outlet 37. The coil-spring 46 serves to move the piston 34 back toits normal position, so that the slidevalve 39 stops the sounding of thewhistle and the rod 41 permits the contact-spring 12 to move again intocontact with the point 11,

thus closing the gap in the primary circuit and preparing it for thenext operation of the alarm.

Changes in the precise embodiment of invention illustrated and describedmay be made within the scope of the following claims without departingfrom the spirit of the invention or sacrificing any of its advantages.

Having thus described the invention, what is claimed is 1. An electricalarm system, comprising an initial circuit, a primary circuit, aparallel circuit, means controlledby the initial circuit for closing theprimary and parallel circuits, means controlled by the primary circuitfor causing the actuation of an alarm, means for automatically breakingthe primary circuit, means controlled by the parallel circuit forpermitting the continued actuation oi the alarm after the breaking ofthe primary circuit, and means actuated by the initial circuit forbreaking the parallel circuit.

2. In an electric alarm system, a normally closed initial circuit,including alarm-boxes, having circuit-breaking means, and a magnet, aprimary circuit, a parallel circuit including a magnet, an armatureassociated with the magnet of the initial circuit, and actuated by thebreaking of said initial circuit to close the primary and parallelcircuits, a motor connected with the primary circuit, an air-pumpoperated by said motor, a controlling-valve for said air-pump operatedby the magnet of the parallel circuit, a piston operated by the pump,and means connected with the piston for sounding an alarm and breakingthe primary circuit.

3. An electric alarm system, comprising an initial circuit, including abattery, a magnet, and a plurality of alarm-boxes having circuitbreakingmeans, an armature associated with the magnet of said initial circuit, aprimary and a parallel circuit connected with said armature, saidparallel circuit including a magnet, a motor operated by the primarycircuit, a plurality of air-compressors operated by said motor, acylinder, piping connecting said air-compressors with said cylinder, avalve in said piping operated by the magnet of the parallel circuit, anair-outlet controlled by said valve, a piston in said cylinder, apiston-rod connected with said piston, a coil-spring surrounding saidpiston-rod, a slide-valve on said piston-rod, a whistle controlled bysaid slidevalve, a rod connected with said slide-valve, and acontact-spring associated with said primary circuit, and adapted to bestruck by said rod.

4. An electric alarm system, comprising an initial circuit, a primarycircuit, a parallel circuit, means controlled by the breaking of theinitial circuit for closing the primary and parallel circuits, meanscontrolled by the primary circuit for causing the actuation of an alarm,means operable upon the actuation of the alarm for breaking the primarycircuit, means controlled bythe parallel circuit for permitting thecontinued actuation of the alarm, and means actuated by the closingofthe initial circuit for breaking the parallel circuit.

5. An electric alarm system comprising three circuits, means actuated'bythe first circuit for controlling the other tWo circuits, meanscontrolled by the second circuit for causing the initial actuation of analarm, and I means controlled by the third circuit for permitting thecontinued actuation of the alarm. In testimony whereof I aflix mysignature in presence of two Witnesses.

HIPPOLYTE M. COOPER. Witnesses:

ABRAHAM GRIDLEY, JAMES J. HOLDSWORTH.

